2014
DOI: 10.1180/minmag.2014.078.2.15
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The quest for forbidden crystals

Abstract: The world of crystallography was forced to reassess its rules about thirty years ago with the introduction of the concept of quasicrystals, solids with rotational symmetries forbidden to crystals, by Levine and Steinhardt (1984) and the discovery of the first examples in the laboratory by Shechtman et al. (1984). Since then, >100 different types of quasicrystals have been synthesized in the laboratory under carefully controlled conditions. The original theory suggested that quasicrystals can be as robust and s… Show more

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Cited by 14 publications
(10 citation statements)
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“…It belongs to the Al-Cu-Fe system and exhibits the composition Al 62.0(8) Cu 31.2(8) Fe 6.8(4) , which is outside the measured equilibrium stability field at standard pressure of the previously reported Al-Cu-Fe quasicrystal121314 (Al x Cu y Fe z , with x between 61 and 64, y between 24 and 26, z between 12 and 13%). The new icosahedral phase was found in one of the meteoritic fragments of the same Khatyrka meteorite recovered from an expedition to the Koryak Mountains in far eastern Russia in 201157 as a result of a search for material that would provide information on the origin of icosahedrite, the first natural quasicrystal. The fragment is labeled Grain 126A to distinguish it from others of Grain 126.…”
mentioning
confidence: 94%
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“…It belongs to the Al-Cu-Fe system and exhibits the composition Al 62.0(8) Cu 31.2(8) Fe 6.8(4) , which is outside the measured equilibrium stability field at standard pressure of the previously reported Al-Cu-Fe quasicrystal121314 (Al x Cu y Fe z , with x between 61 and 64, y between 24 and 26, z between 12 and 13%). The new icosahedral phase was found in one of the meteoritic fragments of the same Khatyrka meteorite recovered from an expedition to the Koryak Mountains in far eastern Russia in 201157 as a result of a search for material that would provide information on the origin of icosahedrite, the first natural quasicrystal. The fragment is labeled Grain 126A to distinguish it from others of Grain 126.…”
mentioning
confidence: 94%
“…The first quasicrystalline phase found in nature, icosahedrite Al 63 Cu 24 Fe 13 34, displayed a five-fold symmetry in two dimensions and icosahedral symmetry in three dimensions and was found in the Khatyrka meteorite, a CV3 carbonaceous chondrite567. The discovery represented a breakthrough in mineralogy and in condensed matter physics.…”
mentioning
confidence: 99%
“…The rock sample was subsequently shown to be a fragment of the Khatyrka meteorite, an oxidized subgroup (Allende-like) CV3 carbonaceous chondrite (CV3 CC), which formed at least 4.5 billion years ago 5 . Additional samples of the Khatyrka meteorite were recovered in an expedition to the Koryak Mountains in Chukotka in 2011 6 7 . A study of those samples provided clear evidence that the meteorite was subjected to a high-pressure shock and that the shock produced a heterogeneous distribution of high pressure and temperature followed by rapid cooling 8 .…”
mentioning
confidence: 99%
“…1), as typically observed for other fragments of the Khatyrka meteorite 4,7,13,14 . Detailed examination by scanning electron microscopy, single-crystal X-ray diffraction, micro-computed tomography and transmission electron microscopy of fragments from Grain 126 associated to proxidecagonite revealed the presence of trevorite, diopside, forsterite, ahrensite, clinoenstatite, nepheline, coesite, stishovite, pentlandite, Cu-bearing troilite, icosahedrite, khatyrkite, taenite, Al-bearing taenite, steinhardtite, decagonite, hollisterite, stolperite and kryachkoite 4,5,7,13,1517 . The recovery of different Al-Ni-Fe crystalline (steinhardtite) and QC (decagonite) intermetallic phases, motivated a careful search for other metallic fragments, which led to the discovery of a particle with composition close to that of the known Al-Ni-Fe decagonal QC but with different diffraction characteristics.
Figure 1Micro-computed tomographic images (at different orientations) of the entire grain (labeled number 126).
…”
Section: Resultsmentioning
confidence: 99%